[Plugin: Folding Category List (FoCaL)] custom post type

I can’t see my custom post types in the categories. So the category looks empty. But it’s not. When I select the ‘cpt’ post the assigned category is highlighted!

I used this code in the functions:

add_filter(‘pre_get_posts’, ‘query_post_type’);
function query_post_type($query) {
if($query->is_archive){
if(is_category() || is_tag()) {
if (empty( $query->query_vars[‘suppress_filters’])) {
$post_type = get_query_var(‘post_type’);

if($post_type) {
return $query;
} else {
$post_type = array(‘post’,’my_post_type’);
$query->set(‘post_type’,$post_type);
return $query;
}
}
}
}
return $query;
}

It shows the cpt in the category. But FoCaL is not able to see the cpt.

Has anybody an idea?

Regards,
Martin

http://wordpress.org/extend/plugins/folding-category-widget/